1. Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA.
2. Paul F. Glenn Center for the Biology of Aging, Stanford University School of Medicine, Stanford, CA, USA.
3. Departments of Clinical Medicine and Biomedicine, Research Laboratory for Biochemical Pathology, Aarhus University, Aarhus, Denmark.
4. Center for Tissue Regeneration, Repair, and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.